Last Summer (마지막 썸머) is an ongoing South Korean drama penned by Jeon Yoo-ri, directed by Min Yeon-hong, and led by Lee Jae-wook, Choi Sung-eun, and Kim Gun-woo.
The story traces two contrasting hearts—one that recoils from warmth and one that longs for it—as a single season becomes their journey of self-discovery and love. The series premiered on KBS2 on November 1, 2025, and airs Saturdays and Sundays at 21:20 KST.
Profile
Drama: Last Summer
Revised Romanization: Majimak Summer
Hangul: 마지막 썸머
Director: Min Yeon-Hong
Writer: Jeon Yoo-Ri
Network: KBS2
Episodes: 12
Release Period: November 1 – December 7, 2025
Runtime: Saturdays & Sundays | 21:20 (KST)
Language: Korean
Country: South Korea
Plot Synopsis By Komoviesonline
“Last Summer” tells the bittersweet story of two brothers and the woman whose life has always been intertwined with theirs — bound together by childhood summers, and separated by the passing of time and tragedy.
Baek Do-Ha (played by Lee Jae-Wook) and his twin brother Baek Do-Yeong grew up apart after their parents’ divorce. While Do-Ha moved to the United States with his mother, Do-Yeong remained in South Korea with their father. Each summer, Do-Ha returns to Korea to spend 21 days at his father’s countryside duplex — a house that holds both family warmth and hidden pain.
Next door lives Song Ha-Kyeong (Choi Sung-Eun) — a spirited yet introverted girl whose father shares a long friendship with the twins’ father. For years, she bickers endlessly with the visiting Do-Ha, never realizing her resentment hides affection. As children, they fight; as teenagers, they fall in love; and as adults, they carry unspoken regrets from one fateful summer two years ago that altered everything.
Now grown, Do-Ha is a talented architect who designs buildings as precise and distant as his own personality. Ha-Kyeong, meanwhile, works as a civil officer in urban architecture — a job that keeps her close to the past she wants to forget. When Do-Ha returns to Korea again, the once-innocent warmth between them becomes a quiet storm of guilt, longing, and questions left unanswered.
Through their intertwined careers, Do-Ha and Ha-Kyeong are forced to confront the “incident” that destroyed their bond — a loss connected to Do-Yeong’s mysterious absence. Love, memory, and grief collide as the summer that began everything returns for one last reckoning.
“Some summers never end — they just live inside you, waiting to be forgiven.”
Main Cast
Lead Roles
Lee Jae-Wook as Baek Do-Ha / Baek Do-Yeong
Twin brothers separated by continents but connected by fate. Do-Ha is a perfectionist architect haunted by guilt, while Do-Yeong represents the warmth he lost.
Choi Sung-Eun as Song Ha-Kyeong
An honest public official who hides her pain behind duty. Her summer memories become both her comfort and her curse.
Kim Gun-Woo as Seo Soo-Hyeok
A charismatic young lawyer entangled in Ha-Kyeong’s life, who challenges her to choose between the past and the present.
Friends & Colleagues
Kwon Ah-Reum as Yoon So-Hee — Do-Ha’s supportive but observant colleague.
Ahn Dong-Goo as Oh Seung-Taek — Do-Yeong’s loyal friend.
Jung Bo-Min as Lee Seul — Ha-Kyeong’s cheerful junior at work.
Family
Choi Byung-Mo as Baek Ki-Ho — Father of the twins, whose choices shaped their split childhood.
Jung Hee-Tae as Song Ji-Chul — Ha-Kyeong’s father and long-time friend of Ki-Ho.
Jeon Su-Ji as Kim Ae-Jung — Do-Ha’s estranged mother.
Son Ji-Yoon as Seo Na-Hyun — Soo-Hyeok’s older sister.
Jeong Jong-Jun as Lee Cheon-Se — The family’s long-serving caretaker.
Child Roles:
Kang Ji-Yong as young Baek Do-Ha
Song Ji-U as young Song Ha-Kyeong
Pacheon City Hall
Kang Seung-Hyun as Jeon Ye-Eun
Ahn Chang-Hwan as Jeon Nam-Jin
Eom Hyo-Seop as Mayor (episode 1)
Lee Seung-Hee as Official (episode 1)
Patan Town Community Service Center
Jang Hyuk-Jin as Town Head
Jung Yi-Rang as Lee Ji-Ae
Chae Dan-Bi as Kim Da-Ye
Pluto Atelier
Lee Tae-Gu as Shin Jong-Shin
Woo Hyun-Jun as Park Hyun
Kang Moon-Kyung as Client (episode 2)
Patan Residents
Includes Kim Ki-Cheon, Jo Hee-Bong, Lee Dong-Yong, Park Sang-Myeon, and Jeong Gyu-Su, portraying local elders and village figures who add warmth and humor to the setting.
Seo Soo-Hyeok’s Group
Kim Kyung-Min as Prosecutor Kim Gi-Man (episode 2)
Special Appearances / Others
Lee Jong-Goo, Kim Nam-Ho, Min A-Ram, and Kang Hak-Soo as homebuyers (episode 1)
Seo Han-Gyeol as Yoon Jeong-Han (episode 2)
Choi Yo-Woon as Nursery Worker (episode 2)
